// https://www.luogu.com.cn/problem/P2010#submit

#include<iostream>
using namespace std;

int day[13] = { 0,31,29,31,30,31,30,31,31,30,31,30,31 };
int x, y;

int main()
{
	cin >> x >> y;
	int ret = 0;
	for (int i = 1;i <= 12;i++)
	{
		for (int j = 1;j <= day[i];j++)
		{
			int k = j % 10 * 1000 + j / 10 * 100 + i % 10 * 10 + i / 10;
			int num = k * 10000 + i * 100 + j;
			if (num >= x && num <= y) ret++;
		}
	}
	cout << ret << endl;
	return 0;
}